Quick-acting regulator of the vibrating type



Jan. 13, 1931. H. MEYER-BERG ET AL 3 'QUICK ACTING REGULATOR OF THEVIBRATING TYPE Original Filed May 24, 1928 IN vew Tali Patented Jan. 13,1931 UNITED STATES PATENT OFFICE HULDREICH MEYER-BERG,

OF BADEN, AND ROBERT KELLER,

O1 ENNETBADEN- BAIDEN, SWITZERLAND QUICK-ACTING REGULATOR THE VIBRATINGTYPE Original application filed Kay 24, 1928, Serial 110. 280,287, andin Germany June 1, 1997. Divided and this application filed Kay 2, 1929.Serial No. 359,980.

lator is, that the trembler contacts are subjcct to rapid destruction,owing to their bcin excessively stressed. This is due to the f act that,when the contacts are being opened, there is too great a difference involtage between the contacts. This difference in voltage is due to therigid resistance connected up parallel to the trembler contacts.Consequently, each time the contacts are opened an arc is formed, theintensity of which depends on the strength of the excitation current andthe drop in voltage. Although by using a resistance having a number ofsteps the formin of sparks by the contacts is diminished, it is stillfar too reat when a considerable excitation current ows,

so that in this case as well the life of the vibrating contacts isveryshort. In the case of the carbon compression type regulator, thedisadvanta es make themselves felt in this way, that t e ohmicresistance of the carbon column is not constant, but is subject toconsiderable variations in the course of time according to the structureof the carbon. This interferes seriously with the fine regulation, sothat the carbon compression regulator can only be made use of in caseswhere no very accurate regulation is required.

The present invention has for its object to provide a quick-actingregulator in which 0 the advantages of the mechanical simplicity of thevibrating regulator and of the carbon com ression regulator are fullyrealized, whil e the electrical disadvantages of the same are avoided.According to the inven- 5 tion a regulable non-inductive resistance isconnected up in parallel to the vibrating or tremble contact of a relator, which resistance can be adjusted tween a minimum and a maximumvalue. As the re lable resistance a carbon compression IGgLLElZOI is vwoul preferably used, which by coacting with the vibrating contactallows of a fine regulation in direct dependence on the excitation ofthe generator.

In the constructional example shown in our prior application Serial No.280 287, from which t e present application has een divided out, thevibrating contact and the carbon compression regulator are jointlycontrolled by the armature of a single electromagnet, but according tothe present invention the two may be controlled independently of oneanother by separate electromagnetic means.

In the constructional example described in our copending applicationSerial No.

280,287, the vibrating re ulator is mechanically rigidly coupled to t ecarbon compression regulator, so that the two are synchronouslycontrolled in dependence on the magnitude of the excitation current ofthe generator. According to the present invention, instead of the tworegulators being mechanically coupled the carbon compression regulatoris independently controlled bg electromagnetic means in dependence on te excitation current of the generator flowing over the vibratincontacts, so that the metallic contacts of t e vibrating regulator arerelieved. The invention may be carried into effect as shown in theaccompanying drawin wherein a is the generator and b the excitationwindin of the same. r is the regulator rovided with an interrupter coil.0, 0 are t e vibrating contacts lying in the excitation circuit.. Inparallel with the vibrating contacts is-the carbon com ression regulatord, the resistance value 0 which is re lated by the pressure of thearmature t Wl'llCh is acted on by the electromagnet 8.

Thus, should the entire excitation current flow over the vibratingcontacts, the electromagnet s will be strongly energized and thearmature t will exert a great pressure on the carbon column of thecarbon compression regulator, the resistance value of the latter beingconsequently reduced. The volta e at the terminals of the generatorconsequently rise. The vibrating regulator, however, immediately offersa greater are resistance, so that through a correspondin diminution inthe attractive force of t e electromagnet the ressure of the armature ton the carbon co umn is reexcitation current duced, and the resistancevalue of the carbon compression regulator thereby increased. This cycleof operations is re- I in dependence on the owing over the vibratingcontacts, so that the vibrating contacts are relieved by the parallelconnected carbon compression regulator.

Having now described our invention, what we claim as new and desire tosecure. by Letters Patent is:

1. A quick acting regulator of the vibrating contact type including apair of vibrating contacts in series with the magnitude to be regulated,an electromagnet for vibrating said contacts, a non-inductive resistanceshunted across said vibrating contacts, and a second electromagnetarranged to vary said non-inductive resistance from a minimum to amaximum value in dependence upon the current flowing through thevibrating contacts.

2. A regulator as claimed in claim 1 peated automaticall wherein thesaid non-inductive resistance is of the compressible carbon In testimonywhereof we names to this specification.

HULDREICH MEYER-BERG. ROBERT KELLER.

plla-te type.

ave signed our

